﻿23 Range of Trenton Species 15 



1. Beginning with the lowest layers exposed in the small 

 quarry near railroad track. Pure, dove-colored limestone in 

 three heavy beds. The small variety of Phytopsis tubulosus is 

 present in large numbers. Fossils few. This is Birdseye lime- 

 stone ; the contact with the Calciferous not shown. 2 ft. 9 in. = 

 2 ft. 9 in. 



Dalmanella testudinaria, c, Leperditia J 'abidites ,r , 



Zygospira recurvirostris, r, Leperditia, small sp. c. 



Primitia log an i, r, 



2. More sandy layers, with numerous poorly preserved fossils. 

 A three inch bed in the middle is made up of much-rounded sand 

 grains. 1 ft. 8 in. = 4 ft. 5 in. 



Trochonema umbilicatum, r, Leperditia fabulites, r, 



Asaphus, sp. und. r, Leperditia, small sp. c. 



Primitia logani, r, 



3. Pure dove colored limestone containing many pelecypods. 

 No " birdseyes." Good collecting. 1 ft. 6 in. = 5 ft. 11 in. 



Rafinesquina altemata, c, -Orthoceras arcuoliratum , r, 



Strophorriena incurvata, c, -O. nmlticameratum, r, 



Zygospira recurvirostris, c, —Oncoceras constrictu?n, r, 

 Ctenodonta levata, r, Asaphus platycephalus, r, 



Whitella ventricosa, r, Primitia logani, r, 



Cuneamya subtru?icata, c, Leperditia, small sp. 



Trochonema umbilicatum, c, 



4. Pure limestone, breaking with conchoidal fracture. The 

 layers are mostly about five inches thick. Phytopsis tubulosus is 

 common, but there are no other fossils except a few specimens of 

 the small Leperditia. 2 ft. = 7 ft. 11 in. 



5. Coarsely crystalline limestone. 5 in. = 8 ft. 4 in. 

 Modiolopsis faba, c, Caly?ne?ie senaria, r. 



6. Dark gray, fine grained, pure limestone. Fossils, not 

 abundant. 2 ft. 6 in. = 10 ft. 10 in. 



Ctenodonta dubia, c, Rafinesquina altemata, r, 



C. levata, r, Leperditia, small sp. r. 



7. Light gray, fine grained, pure limestone in about six inch 

 beds. 2 ft. 4 in. = 13 ft. 2. 



